CN102508289B - Controlled source of pulse codes - Google Patents
Controlled source of pulse codes Download PDFInfo
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- CN102508289B CN102508289B CN 201110335002 CN201110335002A CN102508289B CN 102508289 B CN102508289 B CN 102508289B CN 201110335002 CN201110335002 CN 201110335002 CN 201110335002 A CN201110335002 A CN 201110335002A CN 102508289 B CN102508289 B CN 102508289B
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Abstract
The invention relates to a controlled source of pulse codes. The bottom end of a base connection carriage is connected with a lower pressing plate at the lower one-third position of the carriage, a coil cylinder and a coil are arranged between an upper pressing plate and the lower pressing plate, a fastening screw penetrates through a locating sleeve to be connected with the upper pressing plate and the carriage, a code controller is connected with the coil, an adjustable screw support cylinder is installed in the middle of the upper pressing plate, and an adjustable screw is connected with the adjustable screw support cylinder to form the controlled source. Coding impact orders generated by the controlled source of the pulse codes has ideal paseudo-random characteristics, can notably reduce impact times, improves construction efficiency, and has high seismic prospecting resolution ratio and signal to noise ratio due to the fact that codes stimulate obtained original seismographic records which can be equivalent to macro-energy single-pulse source signals after relevant decoding operation. Mechanical parts of the controlled source can be rapidly disassembled and assembled, and is convenient to carry and construct, applicable to earthquake exploration in cities and mountainous regions and superficial layer projects, simple in structure, convenient to carry and high in stability.
Description
Technical field:
The present invention relates to a kind of seismic prospecting impact type vibroseis, especially the shallow seismic exploration controlled source of pulse codes.
Background technology:
Focus is the source of signal in seismic prospecting, and the focus in offshore shooting mainly contains sparker source and air gun source, and in the seismic prospecting of land, explosive source is used as main focus form always.Yet explosive source exists many drawbacks, at first because the explosive source environmental disruption is more serious, is not suitable for using in the city, uses in the farmland and also usually will pay the damages of great number; Secondly underground for the energy efficient that excites is imported into, explosive source usually will be holed and be excited after landfill, and expensive boring expense makes the cost of seismic prospecting high; Again, in exposed bedrock or mountain region with a varied topography, due to the punching difficulty, also be not suitable for adopting explosive source.Earthquake controllable earthquake focus system (Vibroseis) based on continuous frequency sweep has progressively obtained application in the seismic prospecting of land in recent years, and wherein the hydraulic pressure earthquake controllable earthquake focus system is mainly used in the Exploration of Oil And Gas in deep.The electromagnetic type earthquake controllable earthquake focus system also is not used widely due to the restriction of the inherent characteristic such as little of exerting oneself.In the shallow engineering seismic prospecting, sledgehammer is the simplest a kind of focus, but the sledgehammer focus will adopt the mode of excitation of vertical stack usually in order to overcome random noise.Signal conformance is poor, and labour intensity is high, and operating efficiency is low is the weakness of sledgehammer focus.The Mini-SOSIE Seismic Source System be with relatively light battering ram as focus, form a random pulse sequence by repeatedly exciting for a long time, adopt the relative decoding computing to obtain decoding seismologic record with conventional single shot record approximately equivalent.The weak point of the method is, at first, expect comparatively desirable random shock sequence, need hundreds of time even thousands of inferior impact number of times, time of reception can reach several minutes usually, and conventional seismograph can't meet the demands, reduce the construction exploration efficiency, increased construction cost.Secondly, because the restriction of battering ram inherent characteristic is difficult to obtain desirable random series, therefore, the correlation noise that energy is stronger can produce considerable influence to the signal to noise ratio (S/N ratio) of seismologic record.
Summary of the invention:
Purpose of the present invention just is to provide a kind of controlled source of pulse codes for above-mentioned the deficiencies in the prior art.
The objective of the invention is to be achieved through the following technical solutions:
controlled source of pulse codes, to be equipped with three by base 19 by screw thread to adjust screw 23, base 19 is connected with support connector 21 by gib screw 24, support connector 21 is connected with bracing frame 8 bottoms by bolt or welding, base 19 is connected with hammering block lid 20 by screw, hammering block 22 is slidably matched with base 19, hammering block 22 bottoms are provided with sensor draw-in groove 27, hammering block 22 is connected with 18 stationary fits of copper anvil block, be provided with height adjustment hole 26 more than at lower 1/3rd places of bracing frame 8, by height adjustment hole 26 and gib screw 24, lower platen 16 is housed, coil lower cover 15 is housed on pressing plate 16, coil tube 11 is housed on coil lower cover 15, coil tube 11 is in-built coil 12, block stamp 17 is housed in the middle of coil 12, coil upper cover 10 is fitted on coil tube 11 and coil 12, top board 9 is pressed on coil upper cover 10, holding screw 6 passes locating sleeve 7 is connected with top board and is connected with bracing frame 8, top board 9 is provided with cable-through hole 25, the wire 13 of coding controller 14 passes cable-through hole 25 and is connected with coil 12, adjust screw rod support tube 2 and be contained in the centre of top board 9 by bolt, adjust the middle screw thread that is provided with of upper cover of screw rod support tube 2, adjusting screw 1 is connected with adjustment screw rod support tube 2 by screw thread, adjusting screw 1 is connected with limit sliding chutes 5 by stop screw, stop screw and limit sliding chutes 5 are slidably matched, limit sliding chutes 5 is connected with buffer head 4 by screw, spring 3 is housed between the lower end of the upper end of buffer head 4 and adjustment screw 1 to be consisted of.
The pitch of holes of height adjustment hole 26 is 2-3cm, and the thickness of locating sleeve 7 equates with pitch of holes.
Hammering block 22 is tack hammering block or round end hammering block.
Beneficial effect: the coding sequence of impacts that controlled source of pulse codes produces has desirable pseudo-random characteristics, can reduce significantly the impact number of times, improve operating efficiency, it can equivalence be macro-energy monopulse source signal after the relative decoding computing that coding excites the gained original seismic data, has resolution and the signal to noise ratio (S/N ratio) of higher seismic prospecting.Carrying and construction are convenient in vibroseis mechanical part quick release and assembling, are applicable to URBAN EARTHQUAKE exploration, mountain region seismic prospecting and shallow engineering seismic prospecting, simple in structure, convenient in carrying, stable high.
Description of drawings:
Accompanying drawing 1 is the controlled source of pulse codes structural drawing.
1 adjusts screw, and 2 adjust screw rod support tube, 3 springs, 4 buffer heads, 5 limit sliding chutes, 6 holding screws, 7 locating sleeves, 8 bracing frames, 9 top boards, 10 coil upper covers, 11 coil tubes, 12 coils, 13 wires, 14 coding controllers, 15 coil lower covers, 16 lower platens, 17 block stamps, 18 bronze medal anvil blocks, 19 bases, 20 hammering block lids, 21 support connectors, 22 hammering blocks, 23 adjust screw, 24 gib screws, 25 coil hole, 26 height adjustment holes, 27 sensor draw-in grooves.
Embodiment:
Following tuberculosis drawings and Examples are described in further detail:
controlled source of pulse codes, to be equipped with three by base 19 by screw thread to adjust screw 23, base 19 is connected with support connector 21 by gib screw 24, support connector 21 is connected with bracing frame 8 bottoms by bolt or welding, base 19 is connected with hammering block lid 20 by screw, tack hammering block 22 is slidably matched with base 19, tack hammering block 22 bottoms are provided with sensor draw-in groove 27, tack hammering block 22 is connected with 18 stationary fits of copper anvil block, be provided with height adjustment hole 26 more than three at lower 1/3rd places of bracing frame 8, pitch of holes 3cm, by height adjustment hole 26 and gib screw 24, lower platen 16 is housed, coil lower cover 15 is housed on pressing plate 16, coil tube 11 is housed on coil lower cover 15, coil tube 11 is in-built coil 12, block stamp 17 is housed in the middle of coil 12, coil upper cover 10 is fitted on coil tube 11 and coil 12, top board 9 is pressed on coil upper cover 10, holding screw 6 passes locating sleeve 7 is connected with top board and is connected with bracing frame 8, the thickness of locating sleeve 7 is 3cm, top board 9 is provided with cable-through hole 25, the wire 13 of coding controller 14 passes cable-through hole 25 and is connected with coil 12, adjust screw rod support tube 2 and be contained in the centre of top board 9 by bolt, adjust the middle screw thread that is provided with of upper cover of screw rod support tube 2, adjusting screw 1 is connected with adjustment screw rod support tube 2 by screw thread, adjusting screw 1 is connected with limit sliding chutes 5 by stop screw, stop screw and limit sliding chutes 5 are slidably matched, limit sliding chutes 5 is connected with buffer head 4 by screw, spring 3 is housed between the lower end of the upper end of buffer head 4 and adjustment screw 1 to be consisted of.Adjust screw 23 and be used for adjusting base 19 height.
Coding controller 14 work produce the pulse-code-odulation signal, control coil 12 produces electromagnetic force block stamp 17 is promoted, block stamp 17 is promoted to spring 3 compressions that peak is connected buffer head 4, coding controller 14 turn-offs coil current and cuts off magnetic field simultaneously, block stamp 17 accelerates to move downward under gravity and spring action, block stamp 17 clashes into copper hammering block 18 and produces a shock pulse, and impact energy is transmitted to underground formation Pulse Source signal through tack hammering block 22.System completes the scanning impact process that frequency of impact changes by linear rule under the effect of coding control signal.
controlled source of pulse codes, to be equipped with three by base 19 by screw thread to adjust screw 23, base 19 is connected with support connector 21 by gib screw 24, support connector 21 is connected with bracing frame 8 bottoms by bolt or welding, base 19 is connected with hammering block lid 20 by screw, round end hammering block 22 is slidably matched with base 19, round end hammering block 22 bottoms are provided with sensor draw-in groove 27, round end hammering block 22 is connected with 18 stationary fits of copper anvil block, be provided with height adjustment hole 26 more than five at lower 1/3rd places of bracing frame 8, pitch of holes 3cm, by height adjustment hole 26 and gib screw 24, lower platen 16 is housed, coil lower cover 15 is housed on pressing plate 16, coil tube 11 is housed on coil lower cover 15, coil tube 11 is in-built coil 12, block stamp 17 is housed in the middle of coil 12, coil upper cover 10 is fitted on coil tube 11 and coil 12, top board 9 is pressed on coil upper cover 10, holding screw 6 passes locating sleeve 7 is connected with top board and is connected with bracing frame 8, the thickness of locating sleeve 7 is 2cm, top board 9 is provided with cable-through hole 25, the wire 13 of coding controller 14 passes cable-through hole 25 and is connected with coil 12, adjust screw rod support tube 2 and be contained in the centre of top board 9 by bolt, adjust the middle screw thread that is provided with of upper cover of screw rod support tube 2, adjusting screw 1 is connected with adjustment screw rod support tube 2 by screw thread, adjusting screw 1 is connected with limit sliding chutes 5 by stop screw, stop screw and limit sliding chutes 5 are slidably matched, limit sliding chutes 5 is connected with buffer head 4 by screw, spring 3 is housed between the lower end of the upper end of buffer head 4 and adjustment screw 1 to be consisted of.Adjust screw 23 and be used for adjusting base 19 height.
Coding controller 14 work produce the pulse-code-odulation signal, control coil 12 produces electromagnetic force block stamp 17 is promoted, block stamp 17 is promoted to spring 3 compressions that peak is connected buffer head 4, coding controller 14 turn-offs coil current and cuts off magnetic field simultaneously, block stamp 17 accelerates to move downward under gravity and spring action, block stamp 17 clashes into copper hammering block 18 and produces a shock pulse, and impact energy is transmitted to underground formation Pulse Source signal through round end hammering block 22.System completes the scanning impact process that frequency of impact changes by linear rule under the effect of coding control signal.
Claims (2)
1. controlled source of pulse codes, it is characterized in that: be to be equipped with three by base (19) by screw thread to adjust screw (23), base (19) is connected with support connector (21) by gib screw (24), support connector (21) is connected with bracing frame (8) bottom by bolt or welding, base (19) is connected with hammering block lid (20) by screw, hammering block (22) is slidably matched with base (19), hammering block (22) bottom is provided with sensor draw-in groove (27), hammering block (22) is connected with copper anvil block (18) stationary fit, be provided with height adjustment hole (26) more than at lower 1/3rd places of bracing frame (8), the pitch of holes of height adjustment hole (26) is 3cm, by height adjustment hole (26) and gib screw (24), lower platen (16) is housed, coil lower cover (15) is housed on pressing plate (16), coil tube (11) is housed on coil lower cover (15), coil tube (11) is in-built coil (12), block stamp (17) is housed in the middle of coil (12), coil upper cover (10) is fitted on coil tube (11) and coil (12), top board (9) is pressed on coil upper cover (10), holding screw (6) passes locating sleeve (7) is connected 9 with top board) be connected with bracing frame (8), the thickness of locating sleeve (7) equates with pitch of holes, top board (9) is provided with cable-through hole (25), the wire (13) of coding controller (14) passes cable-through hole (25) and is connected with coil (12), adjust screw rod support tube (2) and be contained in the centre of top board (9) by bolt, adjust the middle screw thread that is provided with of upper cover of screw rod support tube (2), adjusting screw (1) is connected with adjustment screw rod support tube (2) by screw thread, adjusting screw (1) is connected with limit sliding chutes (5) by stop screw, stop screw and limit sliding chutes (5) are slidably matched, limit sliding chutes (5) is connected with buffer head (4) by screw, spring is housed between the lower end of the upper end of buffer head (4) and adjustment screw (1), and (30 consist of.
2. according to controlled source of pulse codes claimed in claim 1, it is characterized in that: hammering block (22) is tack hammering block or round end hammering block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110335002 CN102508289B (en) | 2011-10-28 | 2011-10-28 | Controlled source of pulse codes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110335002 CN102508289B (en) | 2011-10-28 | 2011-10-28 | Controlled source of pulse codes |
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| CN102508289A CN102508289A (en) | 2012-06-20 |
| CN102508289B true CN102508289B (en) | 2013-06-19 |
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| CN 201110335002 Expired - Fee Related CN102508289B (en) | 2011-10-28 | 2011-10-28 | Controlled source of pulse codes |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830425B (en) * | 2012-09-20 | 2015-01-28 | 吉林大学 | Battering ram controllable earthquake focus control device and control method |
| CN104035128B (en) * | 2013-03-06 | 2016-08-03 | 中国石油集团东方地球物理勘探有限责任公司 | Controlled source pseudo random scanning signal creating method |
| CN104155684B (en) * | 2014-08-25 | 2016-11-16 | 中国矿业大学 | Down-hole coal bed work surface the rock burst fatalness area shock wave CT detection self-compensation type controlled source and focus production method |
| US11686869B2 (en) | 2016-12-28 | 2023-06-27 | Jilin University | Seismic vibrator, vibration device and driving apparatus for the same |
| CN111948703B (en) * | 2019-05-17 | 2023-07-25 | 中国石油天然气集团有限公司 | Seismic exploration method and device for mixed seismic source excitation |
| CN112761726B (en) * | 2020-12-30 | 2022-01-28 | 中国矿业大学 | Roof collapse risk assessment and prediction device and method |
| CN113910169A (en) * | 2021-11-02 | 2022-01-11 | 吉林大学 | Hammering device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4969129A (en) * | 1989-09-20 | 1990-11-06 | Texaco Inc. | Coding seismic sources |
| SU1235339A1 (en) * | 1984-08-31 | 1996-03-27 | Западно-Сибирское отделение Всесоюзного научно-исследовательского института геофизических методов разведки | Method of seismic prospecting |
| SU1533524A1 (en) * | 1987-07-21 | 1996-07-20 | Западно-Сибирский научно-исследовательский институт геофизических методов разведки | Method for seismic exploration |
| CN101285891A (en) * | 2008-06-03 | 2008-10-15 | 吉林大学 | Sea electromagnetical type shallow layer earthquake controllable earthquake focus system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU1805414C (en) * | 1990-02-28 | 1993-03-30 | Киевское геофизическое отделение Украинского научно-исследовательского геологоразведочного института | Method of seismic prospecting |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1235339A1 (en) * | 1984-08-31 | 1996-03-27 | Западно-Сибирское отделение Всесоюзного научно-исследовательского института геофизических методов разведки | Method of seismic prospecting |
| SU1533524A1 (en) * | 1987-07-21 | 1996-07-20 | Западно-Сибирский научно-исследовательский институт геофизических методов разведки | Method for seismic exploration |
| US4969129A (en) * | 1989-09-20 | 1990-11-06 | Texaco Inc. | Coding seismic sources |
| CN101285891A (en) * | 2008-06-03 | 2008-10-15 | 吉林大学 | Sea electromagnetical type shallow layer earthquake controllable earthquake focus system |
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Granted publication date: 20130619 Termination date: 20131028 |